You need a 18" piece of 6"x6"x1/4" square tubing with a plate welded on top.
You don't want to have to be picking it up over your head to get it on top the 2x4 and the longer your guide pipe (6x6 tubing in this case) the higher you will have to pick it up. When you get it down to where you can swing the hammer leave the man killer on top and hit the top of it if it's getting to tough to drive into the mud.
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